errno intersects APR error codes

Running gen-make.py on trunk_at_1487954, I get the following warning at the end:

[[[
WARNING: errno intersects APR error codes: set([10000, 10004, 10009,
10013, 10014, 10022, 10024, 10035, 10036, 10037, 10038, 10039, 10040,
10041, 10042, 10043, 10044, 10045, 10046, 10047, 10048, 10049, 10050,
10051, 10052, 10053, 10054, 10055, 10056, 10057, 10058, 10059, 10060,
10061, 10062, 10063, 10064, 10065, 10066])
]]]

I have not seen this before. Is this something new? Anyone else seeing this?

I haven't built trunk for a while, and just changed a couple of
dependencies, so it might also be something local.

For reference:
Visual Studio 2010 on Windows XP
Release build
OPENSSLVER=1.0.1c
HTTPDVER=2.2.22
SERFVER=1.2.0
SQLITEVER=3.7.17
ZLIBVER=1.2.6
JUNITVER=4.10

C:\research\svn\client_build\trunk2>python gen-make.py --release
--with-junit=C:\research\svn\client_build\svn_deps\junit-4.10\junit.jar
--with-httpd=C:\research\svn\client_build\svn_deps\httpd-2.2.22
--with-serf=C:\research\svn\client_build\svn_deps\serf-1.2.0
--with-openssl=C:\research\svn\client_build\svn_deps\openssl-1.0.1c
--with-sqlite=C:\research\svn\client_build\svn_deps\sqlite-amalgamation-3.7.17
--enable-ml --with-zlib=C:\research\svn\client_build\svn_deps\zlib-1.2.6
--vsnet-version=2010 -t vcproj

--
Johan